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Investments (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities
March 31, 2022Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $31 $(40)$2,102 
Non-U.S.25,304 (16)380 (884)24,784 
Corporate and asset-backed securities38,469 (11)360 (1,149)37,669 
Mortgage-backed securities20,511 — 90 (796)19,805 
Municipal5,131 — 49 (61)5,119 
$91,526 $(27)$910 $(2,930)$89,479 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,180 $— $1,180 $12 $(18)$1,174 
Non-U.S.1,185 (5)1,180 19 (8)1,191 
Corporate and asset-backed securities1,913 (28)1,885 56 (6)1,935 
Mortgage-backed securities1,689 — 1,689 8 (13)1,684 
Municipal3,885 (1)3,884 24 (4)3,904 
$9,852 $(34)$9,818 $119 $(49)$9,888 
December 31, 2021Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $109 $(6)$2,214 
Non-U.S.25,156 (8)953 (272)25,829 
Corporate and asset-backed securities37,844 (6)1,410 (185)39,063 
Mortgage-backed securities20,080 — 532 (123)20,489 
Municipal5,302 — 216 (5)5,513 
$90,493 $(14)$3,220 $(591)$93,108 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,213 $— $1,213 $34 $(3)$1,244 
Non-U.S.1,201 (5)1,196 66 — 1,262 
Corporate and asset-backed securities2,032 (28)2,004 197 — 2,201 
Mortgage-backed securities1,731 (1)1,730 74 (1)1,803 
Municipal3,976 (1)3,975 162 — 4,137 
$10,153 $(35)$10,118 $533 $(4)$10,647 
Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities
March 31, 2022Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $31 $(40)$2,102 
Non-U.S.25,304 (16)380 (884)24,784 
Corporate and asset-backed securities38,469 (11)360 (1,149)37,669 
Mortgage-backed securities20,511 — 90 (796)19,805 
Municipal5,131 — 49 (61)5,119 
$91,526 $(27)$910 $(2,930)$89,479 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,180 $— $1,180 $12 $(18)$1,174 
Non-U.S.1,185 (5)1,180 19 (8)1,191 
Corporate and asset-backed securities1,913 (28)1,885 56 (6)1,935 
Mortgage-backed securities1,689 — 1,689 8 (13)1,684 
Municipal3,885 (1)3,884 24 (4)3,904 
$9,852 $(34)$9,818 $119 $(49)$9,888 
December 31, 2021Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $109 $(6)$2,214 
Non-U.S.25,156 (8)953 (272)25,829 
Corporate and asset-backed securities37,844 (6)1,410 (185)39,063 
Mortgage-backed securities20,080 — 532 (123)20,489 
Municipal5,302 — 216 (5)5,513 
$90,493 $(14)$3,220 $(591)$93,108 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,213 $— $1,213 $34 $(3)$1,244 
Non-U.S.1,201 (5)1,196 66 — 1,262 
Corporate and asset-backed securities2,032 (28)2,004 197 — 2,201 
Mortgage-backed securities1,731 (1)1,730 74 (1)1,803 
Municipal3,976 (1)3,975 162 — 4,137 
$10,153 $(35)$10,118 $533 $(4)$10,647 
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]
The following table presents the amortized cost of our HTM securities according to S&P rating:
March 31, 2022December 31, 2021
(in millions of U.S. dollars, except for percentages)Amortized cost% of TotalAmortized cost% of Total
AAA$2,021 21 %$2,089 21 %
AA5,210 52 %5,303 52 %
A1,922 20 %1,964 19 %
BBB676 7 %773 8 %
BB23 — %23 — %
Other— — %1 — %
Total$9,852 100 %$10,153 100 %
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
 March 31, 2022December 31, 2021
(in millions of U.S. dollars)Net Carrying ValueFair ValueNet Carrying ValueFair Value
Available for sale
Due in 1 year or less$4,393 $4,393 $4,498 $4,498 
Due after 1 year through 5 years25,136 25,136 25,542 25,542 
Due after 5 years through 10 years27,033 27,033 28,207 28,207 
Due after 10 years13,112 13,112 14,372 14,372 
69,674 69,674 72,619 72,619 
Mortgage-backed securities19,805 19,805 20,489 20,489 
$89,479 $89,479 $93,108 $93,108 
Held to maturity
Due in 1 year or less$871 $872 $888 $894 
Due after 1 year through 5 years3,754 3,742 3,744 3,846 
Due after 5 years through 10 years2,004 2,015 2,242 2,349 
Due after 10 years1,500 1,575 1,514 1,755 
8,129 8,204 8,388 8,844 
Mortgage-backed securities1,689 1,684 1,730 1,803 
$9,818 $9,888 $10,118 $10,647 
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position
The following tables present, for Available for Sale (AFS) fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have expected credit losses, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position:
0 – 12 MonthsOver 12 MonthsTotal
March 31, 2022Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$946 $(31)$98 $(9)$1,044 $(40)
Non-U.S.12,654 (608)2,385 (222)15,039 (830)
Corporate and asset-backed securities21,082 (899)2,041 (216)23,123 (1,115)
Mortgage-backed securities13,657 (646)1,589 (150)15,246 (796)
Municipal
1,225 (60)16 (1)1,241 (61)
Total AFS fixed maturities $49,564 $(2,244)$6,129 $(598)$55,693 $(2,842)
0 – 12 MonthsOver 12 MonthsTotal
December 31, 2021Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$363 $(3)$70 $(3)$433 $(6)
Non-U.S.6,917 (196)1,093 (62)8,010 (258)
Corporate and asset-backed securities9,449 (145)806 (32)10,255 (177)
Mortgage-backed securities8,086 (116)190 (7)8,276 (123)
Municipal
226 (5)— — 226 (5)
Total AFS fixed maturities$25,041 $(465)$2,159 $(104)$27,200 $(569)
Schedule of Realized Gain (Loss)
The following table presents the components of Net realized gains (losses):
Three Months Ended
March 31
(in millions of U.S. dollars)20222021
Fixed maturities:
Gross realized gains$39 $37 
Gross realized losses(127)(19)
Net (provision for) recovery of expected credit losses(12)6 
Impairment (1)
(36)— 
Total fixed maturities (136)24 
Equity securities56 367 
Other investments55 38 
Foreign exchange75 76 
Investment and embedded derivative instruments47 109 
Fair value adjustments on insurance derivative35 319 
S&P futures42 (44)
Other derivative instruments1 (1)
Other (2)
(74)(1)
Net realized gains (losses) (pre-tax)$101 $887 
(1)Relates to certain securities we intended to sell and securities written to market entering default.
(2)Other realized losses include impairment of assets related to Chubb's Russian entities.
Gain (Loss) on Securities [Table Text Block]
Realized gains and losses from Equity securities and Other investments from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
Three Months Ended
March 31
20222021
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains recognized during the period$56 $55 $111 $367 $38 $405 
Less: Net gains recognized from sales of securities255 — 255 45 — 45 
Unrealized gains (losses) recognized for securities still held at reporting date$(199)$55 $(144)$322 $38 $360 
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block]
The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
Three Months Ended
March 31
(in millions of U.S. dollars)20222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$14 $20 
Provision for expected credit loss17 4 
Recovery of expected credit loss(4)(9)
Valuation allowance for expected credit losses - end of period$27 $15 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$35 $44 
Recovery of expected credit loss(1)(1)
Valuation allowance for expected credit losses - end of period$34 $43 
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]
The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
Three Months Ended
March 31
(in millions of U.S. dollars)20222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$14 $20 
Provision for expected credit loss17 4 
Recovery of expected credit loss(4)(9)
Valuation allowance for expected credit losses - end of period$27 $15 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$35 $44 
Recovery of expected credit loss(1)(1)
Valuation allowance for expected credit losses - end of period$34 $43 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
 Expected
Liquidation
Period of Underlying Assets		March 31, 2022December 31, 2021
(in millions of U.S. dollars)Fair
Value		Maximum
Future Funding
Commitments		Fair
Value		Maximum
Future Funding
Commitments
Financial
2 to 10 Years
$1,146 $153 $1,096 $267 
Real assets
2 to 13 Years
1,544 735 1,193 766 
Distressed
2 to 8 Years
886 920 753 641 
Private credit
3 to 8 Years
84 280 84 279 
Traditional
2 to 14 Years
6,928 5,121 6,647 5,200 
Vintage
1 to 2 Years
65 — 68 — 
Investment fundsNot Applicable294 — 267 — 
$10,947 $7,209 $10,108 $7,153 
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
March 31December 31
(in millions of U.S. dollars)20222021
Trust funds$8,785 $9,915 
Deposits with U.S. regulatory authorities2,370 2,402 
Deposits with non-U.S. regulatory authorities2,802 2,873 
Assets pledged under repurchase agreements1,443 1,420 
Other pledged assets734 634 
Total$16,134 $17,244